From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: regression when connecting to ipv6 localhost
Date: Sun, 14 Oct 2012 23:07:38 +0200
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Cc: netdev@vger.kernel.org
To: Jan Hinnerk Stosch <janhinnerk.stosch@gmail.com>
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On Sun, 2012-10-14 at 22:39 +0200, Jan Hinnerk Stosch wrote:

> ntpd    368  ntp   16u     IPv4              10453      0t0    UDP *:ntp
> ntpd    368  ntp   17u     IPv6              10454      0t0    UDP *:ntp
> ntpd    368  ntp   18u     IPv4              10460      0t0    UDP
> localhost.localdomain:ntp
> ntpd    368  ntp   19u     IPv4              10461      0t0    UDP
> hinniepc.fritz.box:ntp
> ntpd    368  ntp   20u     IPv6               8775      0t0    UDP
> [fe80::922b:34ff:fe33:c292]:ntp
> ntpd    368  ntp   21u  netlink                         0t0  10463 ROUTE

Hmm, your ntpd doesnt listen normally to ::1 UDP 123

grep ntpd /var/log/syslog :

(Here I have : )

ntpd[4912]: ntpd 4.2.6p3@1.2290-o Mon Aug 20 15:15:21 UTC 2012 (1)
ntpd[4913]: proto: precision = 0.980 usec
ntpd[4913]: ntp_io: estimated max descriptors: 1024, initial socket
boundary: 16
ntpd[4913]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
ntpd[4913]: Listen and drop on 1 v6wildcard :: UDP 123
ntpd[4913]: Listen normally on 2 lo 127.0.0.1 UDP 123
ntpd[4913]: Listen normally on 3 eth1 172.30.42.8 UDP 123
ntpd[4913]: Listen normally on 4 lo ::1 UDP 123
ntpd[4913]: Listen normally on 5 eth1 fe80::222:15ff:fe87:3ff6 UDP 123
ntpd[4913]: peers refreshed
ntpd[4913]: Listening on routing socket on fd #22 for interface updates